The formula to calculate the Heat to Power Ratio (HPR) is:
\[ HPR = \frac{H}{P} \]
Where:
Let's say the heat output (H) is 500 units, and the power output (P) is 100 units. Using the formula:
\[ HPR = \frac{500}{100} = 5 \]
So, the heat to power ratio is 5.